2 Answers
2

There is a group roll and the player who wins the roll says the dialogue option they chose. Everyone hears that player’s choice and the deal with the consequences of that choice.

This can lead to some interesting conversation dynamics if the leader is in the minority.

One important detail to note is that Light side and Dark side points are not awarded to the group for the choice depicted, but for each player individually according to the choice they made individually.

I asked this question, because the only Flashpoint I was in had upwards of 40 conversation choices in it, and the only one where my response was selected was the destination at the end (which, being after the last boss is defeated, has no bearing on the story).
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user2974Dec 17 '11 at 17:45

@Powerlord Random is random, I guess. Got another source that says the same thing. Editing it in now.
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Raven Dreamer♦Dec 17 '11 at 17:52

1

Supposedly every time you don't get a say adds a bonus to the next roll. It's still entirely possible to get through a very long conversation without getting a single word in edgewise, but they've done their best to make it unlikely.
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ShadurDec 21 '11 at 8:15

Numerically, each person rolls a d100 (random number between 1 and 100), with a bonus of 20 for each time you lose. The highest wins.

E.g., d100 the first time you get asked, d100+20 if you failed that, then d100+40 the next ... reseting back to d100 after you win one. (Logically, this makes it impossible to lose six times in a row when traveling with a single person).

You get twice as many social points when you win, as well as the opportunity to decide what actually happens in a quest if hitting an actual decision point.

I haven't worked out what happens with a tie; I've seen them happen and one person wins, but I can't judge why. I'll assume a hidden internal coin-flip, or possibly it picks whoever has lost more at that point.